Hi,
I was wondering if anybody had some pointers for the design of a low voltage (0.5 - 2.0 V) high amp (10 - 20A) power supply. This will power a resistive load (it might have a slightly inductive component, however that is not determined yet), in a pulsed (10 - 100Hz) square wave, at a duty cycle of 5-10%. All the parameters I mentioned would be adjustable, until the best ones are determined...
Also, the power supply inputs should be pretty low also, probably <
24VDCAny ideas ?
Thanks
bruno
John Popelish skrev:
if it is a for a one of, maybe hacking a not too old motherboard would be an idea...
-Lasse
Take a look at the multi-phase PWM switching regulators from National Semiconductor. This one is designed to provide 1.3 to 3.5 volts out, but you can scale that down by amplifying the output voltage before connecting it to the feedback pin.
Unfortunately for the hobbyist, it isn't available in a plug in DIP case.
I am curious, what are you trying to accomplish...
i
Generally the pwm chips for powering Pentium & Co. will do such thing. Or use a pic and 2 Power-MOSFET as custom pwm power supply.
- Henry
schrieb im Newsbeitrag news: snipped-for-privacy@g49g2000cwa.googlegroups.com...
Thanks, good link. So I can just use an opamp to scale the output before feeding it to the feedback pin, that is your suggestion ? I see how it would work...
I do not care about the DIP packaging. I realized not too long ago that smt means less holes to drill, which is much faster and easier for prototyping and home making PCBs...
With some solder paste and an hot air gun, soldering is also easier than through-hole. Much faster too. I do not know what the hang-up with smt is among hobbiests. I think it s just inertia and resistance to change. At least it was with me.
bruno
If you multiply the output voltage with a gain of 2 (output voltage to the + input, output to - input through 10k, - input to ground through another 10k) this will allow the feedback pin to see a signal of 1.5 to 3.5 volts (the normal selectable output voltages) when the output voltage actually varies between 0.75 and 1.75 volts. A 5 volt rail to rail opamp would work fine.
Well, if you do decide that a DIP makes anything easier, Digikey (and others) sell an adapter that you solder the SMT pack to and it has normal DIP pins on the other side. This is handy during testing if you have to remove the chip for testing or replacement.
Getting scope probes connected to those little legs can be a problem.
Here is the data sheet to go along with that app note.
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